NDIA is entering a defining decade for its water and wastewater management. The challenge   is monumental, but so is the opportunity. With surging industrialisation, relentless urbanisation, and climate-sensitive agriculture, the country’s wastewater market is no longer an environmental issue alone-it is an economic, social, and political imperative.

According to recent estimates, India’s water and wastewater treatment market, valued at USD 13.1 billion in 2023, is projected to reach USD 23.8 billion by 2033, growing at a CAGR of 6.2%. This growth trajectory reflects not just expanding demand but a systemic necessity to fix a deeply fragmented and under-equipped wastewater infrastructure.

The Paradox of Growth: More Water, More Waste

India’s  wastewater challenge is largely urban. Over 70% of the urban population con­ tributes significantly to the country’s waste­ water load. Shockingly, 70°/o of urban waste­ water remains untreated, flowing directly into rivers, lakes, and coastal zones. This is not merely an environmental tragedy; it is a ticking time bomb for public health, groundwater reserves, and food security.

The industrial footprint further complicates the scenario. Thermal power plants alone consume 87.8% of industrial water-a figure that dwarfs other sectors. As industrial output increases, so does the complexity of waste­ water composition, necessitating advanced, sector-specific treatment technologies. Industries such as textiles, pulp and paper, chemicals, and FMCG are now among the top consumers of treatment solutions.

Yet, while the need is apparent, implementation is patchy. In 2023, India’s effluent treatment market was estimated at just USD 1.4 billion, trailing significantly behind water treatment (USD 6.6 billion) and sewage treatment (USD 5 billion). By 2033, effluent treatment is expected to grow to USD 2.4 billion but still lags behind, indicating an insufficient industrial response to regulatory and sustainability pressures.

Public Intent, Private Hesitation

The government has responded with a flurry of policies and missions: Jal Jeevan Mission, AMRUT 2.0, Namami Gange, and SWAJAL. Together, these initiatives aim to transform water access and sanitation infrastructure across 700,000 villages and all urban local bod­ ies. Budgetary allocations have surged, and institutional convergence through the Ministry of Jal Shakti has improved inter­ agency coordination.

But public investment alone is not enough. Private sector participation remains hesitant due to several factors: (1) High capital and operational costs: Equipment installation and maintenance are expensive. Many municipalities and industrial units are reluctant to commit to long-term investments without guaran­ tees of ROI. (2) Technological fragmentation: A wide range of competing treatment technologies-ranging from activated sludge processes to membrane bio-reactors-creates confusion and implementation bottlenecks. (3) Lack of techno-commercial awareness: Several states still struggle with basic feasibility assessments, cost-recovery models, and vendor management, leading to failed or underperforming projects. (4) Limited reuse mindset: Despite the potential, the adoption of wastewater recy­ cling and zero liquid discharge (ZLD) is still nascent. Cultural perceptions and regulatory ambiguity restrict the use of treated water, especially in agriculture and industry.

Innovation Meets Inequality

Despite these hurdles, innovation is taking root. Tamil Nadu and Gujarat are leading the way in deploying large-scale desalination plants for both municipal and industrial use. The private sector is increasingly shifting from chemical-based to membrane-based technologies, notably reverse osmosis (RO), sequencing batch reactors (SBR), and membrane bioreactors (MBR).

Such technologies not only enhance treatment efficiency but also align with India’s broader environmental goals. In fact, the market for these technologies is expected to grow exponentially as industrial and municipal actors seek low-footprint, high-output systems that offer flexibility and reuse potential.

Moreover, the concept of a circular water economy is gaining momentum. Industries are gradually embracing the “3R” principles-Reduce, Recycle, Reuse-to minimise freshwater dependency and lower their regulatory liabilities.

However, India’s wastewater story is also a story of regional disparity. States like Maharashtra, Tamil Nadu, and Delhi lead in terms of installed treatment capacity, while others like Bihar, Jharkhand, and the north­ eastern states remain grossly underserved. As per recent assessments, state-wise sewage treatment capacity in several regions still falls short of the generation volume by over 40%.

The consequence is not merely localised pollution but national-level risks. Untreated waste­ water contaminates groundwater tables, increases the salinity of arable land, and worsens India’s growing agro-climatic stress, especially in rain-fed regions. These risks are magnified by the lack of centralised monitoring systems, further complicating policy responses.

Policy Gaps and the Path Forward

While the regulatory environment has become stricter, enforcement remains weak. Many private units operate without functional ETPs (Effluent Treatment Plants) and often discharge untreated water due to loopholes or lack of oversight. Additionally, pricing models for water-heavily subsidised or politically manipulated-fail to reflect the real cost of treatment, discouraging conservation and infrastructure investment.

To future-proof the market, India must address these gaps through clear pricing signals for water use and wastewater discharge, mandatory ZLD requirements for high-pollution industries, tax incentives and green bonds to lower financial barriers for private players, decentralised treatment systems for peri­ urban and rural clusters, and real-time monitoring systems using IoT and AI for compliance and transparency.

India’s wastewater market can no longer rely on ad hoc schemes and fragmented governance. What’s needed is a national water strategy that integrates climate adaptation, groundwater recharge, urban planning, and industrial policy into one cohesive blueprint.

If the projections hold true, by 2033, India will be treating over USD 24 billion worth of wastewater annually. Yet, the true metric of success will not be market size-but how much of this water is reused, how equitably services are distributed, and how many ecosystems are restored.

The road ahead is difficult but navigable. The convergence of public funding, private innovation, and community ownership could transform wastewater from a liability into a resource. In the coming decade, wastewater is no longer waste-it is India’s most under­ utilised asset.

Dr. Souryabrata Mohapatra, Assistant Professor, IIT Jodhpur, Dr. Sanjib Pohit, Full Professor, NCAER New Delhi, Views are personal.